But you didn't wanted this game at the first place, that doesn't explain anything to the problem. The question in this comment is you 'accidentally' bought this game when you wanted to buy TF2 items. How the ♥♥♥♥ did you manage to do that?

so your graphics card is good enough to run the demo but not good enough to run the complete game? this is kind of do not make any sense. the graphics quality in the demo and the complete game are exactly the same.

this sounds like you just bought this by accident and now want a full refund because you want the tf2 items. just be a man about it, admit your mistake and try to explain everything in an email to frictional and steam, maybe you get partial refund at least. which is more then nothing.

Submit a ticket to Steam and ask for a refund. There's a chance you either get a your money back or not. Tell them what happened and what's the problem. If you don't know how to request a refund, just: